Vacuum carburetor



. July 14, 1925. 1:545593 E. i... MEISINGER VACUUM CARBURETOR Filed Jan. 19, 1924 5 Sheets sheet l 314130 to@ ll'lealszyer July 14, 1925.

E. L. IIVIEISINGx-:R VACUUM CARBURETOR Filed Jan. 19," 1924 3 Sheets-Sheet 2 'Suoi M136 July 14, 19.25.v 1,545,593

E. L. MEISINGER VACUUM CARBURETOR Filed Jan. 19, 1924 :s sheets-sheet 5 SHQ: "uf

Patented July 14, 1925.

UNITED STATES PATENT orifice.

EDWARD L. MEIlSINGER, FV CLARION, PENNSYLVANIA.

VACUUM CARBURETQR.

Application led January 19, 1924. Serial No. 687,332.

buretors, of which the following is Va specification. l

The invention relates to improvements in a vacuuma carburetor.

It is an object of the invention to provide' a carburetor construction having combined therewith in a single casting a vacuum tank, thereby providing a structure where the vacuum tank and the carburetor comprise a single unit.

The invention more specificially comprehen'ds a vacuum carburetor of this character wherein a single casting is formed to provide the Float chamber of a carburetor and the vacuum tank with an integral partition in said. casting, forming such chamber and tank. The invention further consists of an improved float operated valve for controlling the suction in the float chamber whereby said valve will always remain in either an entirely open or an entirely closed position` and will not occupy intermediate positions.

In the accompanying drawings, I have shown the preferred embodiment of my invention in which Fig. 1 represents a side elevation,

Fig. 2 a top plan view,

Fig. 3 a transverse section,

Fig. 4 a sectional view from the check valve,

Fig. 5 a transverse sectional view and,

Figs. 6, 7, 8, 9 and 10 detail views of the valve operating mechanism.

Referring now more particularly to the drawings, wherein like reference characters indicate corresponding parts, numeral 1 designates a connection containing the mixing chamber 3, the connection l being secured to the usual intake manifold of an engine. This connection at its lower end is flanged at 4 and receives a combined carburetor and vacuum tank designated by the character a.. Fastening screws 5 are used for attaching this tank to the connection 1.

The combined vacuum tank and carburetor is composed of a single casting of metal, having a vacuum tank 6 at one side, and a constant fuel level reservoir 7 at the opposite side. The vacuum tank is separated from the fuel reservoir by the integral par-l tition 8 and the integral circular carbureting'or mixing chamber 9, as clearly shown 1 in Figure 5. In describing this device, the vacuum tank will be first described in detail and then its connection to the constantJ level fuel reservoir and the feeding means from said reservoir to the mixing `chamber of the carburetor.

- The vacuum tank is, as before stated, cast integral with the chamber 7. This tank is provided with a removable closure 10 shown as having a downwardly extending flange 11 united to the top of the vacuum chamber 6 by screws 12 or the like. Communicating with the vacuum tank, there is a suction pipe 12 leading to the connection 1 above the throttle valve 2 and its opposite end terminating within the closure 11. There is also a vent opening 13 passing through the nipple 14 which nipple is securedto the cover 10, the vent communicating with the atmosphere in the usual manner. A gasolene conveying pipe 15 leads from the gasolene supply tank of the motor vehicle, usually lower than the level of the vacuum-` tank, this pipe beng secured to cover plate .11 by the fastening nut 16. In use, it is closed. In accordance with my invention,

I provide valves for controlling said vent opening and said suction line responsive to the liquid level of gasolene in the vacuum tank 6. With this .end in view, I provide a float 17 which is connected to an arm 18 pivoted between the spaced downwardly extending brackets 19 having a connecting lower web 20. When the float valve is in the full line position shown in Fig. 5' there is sullicient fuel in the vacuum tank 6, hence the suction pipe 12 is closed and the vent opening 13 open. 21 designates the suction pipe valve, which is a valve of the usual construction used in vacuum tanks, while 22 .designates the vent passage controlling valve, these valves being pivotally connected to the links 23 at each end thereof, the links attheir center are pivoted to a depending bracket 24 so that as the links rock the valves. will likewise move, and when one valve is closed the other valve 'must be opened. Pivotally connected to the links 23 there are arms 26 which are suspended by, the said bracket 24, the .free end of the arm/s:

' ards for the float valve 17.

. ed to the entering a space between supporting standy Pivotally connected to said arms 26, there are the trip arms 27 pivotally connected at their lower Y ends to the pivoted rod 8 carrying the float' 17. As the float drops it naturally draws downwardly the trip arms 27 and these arms likewise move' the pivoted arms 26 in a downward direction. A lateral pin constitutes the pivotal connection between the arms 26 and 27 and said pin at its outer end receives one end of the coil springs 29, the opposite ends of'said springs being connectv pin 30 which passes through and joins the links 23 to the valve 21. lt is apparent that during the downward movement of the arms 26, the free ends of said arms are guided by the standard. 19. When the iioat has reached a position as shown in Fig. 8, the arms 26 have been drawn downwardly so that the 'coil springs 29 are below the point of pivot of the rocking links 23. The moment that such springs extend beyond or to one side of this pivoted connection, the springs obviously exert an iniuence on the links and serve to draw these links downwardly with a snap action. This means that the suction controlling valve 21 is ywide open and the vent valve 22 entirely closed. In

other words, the snap action of the spring will notpermit either one of the valves to be partiallyjopen or closed. They' must be entirely open or entirely closed. As the float rises and moves in an upward path it, of course, raises with it the trip arms 27, which lifts thearms 26 and as soon as said arms reach a position above the pivoted support for thelinks 23, the coil springs 29 will exert a counter influence on these links and will snap the links into the 4positions shown in Fig. 5 at which time the suction controlling` valve 21 is entirely closed and the vent valve 22 open, inasmuch as the vacuum tank is full of fuel and it is desirable to maintain an atmospheric pressure therein. The position of the oat valve will,

of course, uctuate during the use of the engine-'that is, it will drop when substantial quantities of fuel are being used and will remain in a position to permit the suction i e to be opened as long as the tank is not ed. When the tank fills, however, this suction valve is closed and the vent valve opened.

The fuel in the vacuum tank 6 constitutes a reservoir supply for the fuel feeding tank 7. The partition 8 in the casting is formed at its lower end near each side with diver ing walls and between said diver wa 8 are plugs 9 detachablyinse by means of fastening screws 1l. These plugs each have a transverse bore 10 and the diverging walls ofthe partition are also ported. The lugs 9 each carry a Hap valve 12' as clearly shown in Fig. 4. Fuel from the vac- 'l1`uel is supplied to the mixin uum chamber 6 flows through the ports 10 and into the constant level supply chamber 7 of the carburetor. The level of the fuel in this chamber will remain the same as the fuel level in the vacuum tank 6. When the chamber 7 is lilled the iap valves 12 will,

of course, close because of the equalization of pressure and will remain closed until the supply in the chamber 7 is lower than the fuel level in the vacuum tank 6. When this condition is reached the flap valves open for the passage of fuel to the chamber 7. f

The central opening 9 formed in the casting is adapted to receive an inserted venturi or cone-shaped member 31 inserted therein to provide a jacket 32 adapted to receive heating gases from the engine to assist in vaporizin the fuel. The reduced opening through t is venturi 31 seats an, air valve 33 having a shaft or stem 34 passing through a bracket 35, the lower end of said stem receiving a coil spring 36, the tension of which is regulated by a nut 37. The stem intermediate its ends and where' it passes through the bracket 35 is rectangular in shape. It is apparent that the inserted tube or venturi 31 1s open at its lower end and that the valve 33 controls the quantity of air admitted to the mixing chamber- 3. chamber through the high and low s eed el feeders 39 and 40, res ctively. ese feeders are controlled by hee valves 41 and 42 vwhereby the richness of the mixture may be regulated. The. low speed feeder 40 communicates with a conduit 43 opening at one end beneath the air valve 33 and at its o posite end in the mixing chamber 3, while the fuel feeder 39 enters the chamber ata point directly above the air valve 33.

Having thus described the invention, the operation may be briefly stated as follows: When thev engine is running and fuel is being drawn into the vacuum tank 6, the

float valve 17 has dropped to a position whereupon the arms 26 are lowered'and the springs 29 have snapped the links 23 to a position to open the valve 21 and close the vent valve 22. This permits the creation of a vacuum in the tank 6, 'drawing the fuel thereto through the feeding pipe 15. When thetank 6 becomes filled, the float raises and this, of course, rais the arms 26 to a tion where the springs 29 shift the position of the links 23 and open the valve 21 -and close the valve 22. The fuel admitted to the vacuum tank 6 flows over and into the constant level fuel reservoir 7 through the ports 10 in the plugs 9 and the llap valves 12 maintain the level in the two chambers uniform. The suction of the en e draws the fuel from the fuel chamber ulhrough the feeding pipes 39 and 40 where it mixes with the required antit of air admitted to the mixing cham r 3 y the opening of the air valve 33. This operation'continues, it being apparent that both the carburetor and the vacuum tank are formed in a unitary structure and from a single casting.

Having thus described the invention, what I claim is:

1. A combined icarburetor and vacuum tank having a vacuum chamber and a fuel feeding chamber formed from a single metallic casting, said casting-having an integral central partition dividing said chambers, said partition at substantially its center being formed with an enlarged air passage for the passage of air between said chambers, a suction controlled valve in said air pasage, float controlling means in the vacuum chamber for controlling the admission of fuel thereto and a suction connection between said chamber and an engine manifold, the walls of said artition diverging toward the bottom of t e casting, there o being fuel feedinnr openings in said separatedw'alls for delivering fuel from the Y vacuum chamber to said fuel feeding chamber, a removable substantially triangular lug member provided with an opening ml ine with the openings in said walls of said partition, a valve controlling said opening carried b said plug andremovable therewith, an means for feeding fuel through said fuel chamber to said central air passage above the air valve therein, a mixing chamber adjacent said air valve, and a throttle.

valve in said mixing chamber.

2. In an article of the character described,

the combination with an enlarged casting, v

said casting being formed with an ,integral vacuum chamber and fuel feeding chamber, an integral substantially central partition dividing said chambers and intermediate its ends being formed to provide a substantially circular carburetting chamber, an air valve lin said chamber, a throttle valvetherein, a

disposed between said diverging walls of the p partition, a check valve carried by said plug and removable therewith as a unit, and means for retaining said plug in position.

In testimony whereof I aiix my signature.

EDWARD' L. MEISINGER. f 

